Mass number = number of protons + number of neutrons
mass number= 8 + 7= 15 ---> the answer is B.
Answer:
Why would it be false? That would be a great magic act.
Explanation:
Answer is: <span>the winning recipe.
</span>An appositive is a noun<span> or </span>noun phrase<span> that renames another noun right beside it. The appositive can be a short or long combination of words.
</span>Another example: Problem number 19, the final question, was difficult - the final question is<span> the appositive phrase in this sentence.</span>
Explanation:
To calculate that you need to know the value of the Kps (constant of solubility) at 30°C of KBr in water.
<u>When the product of the concentrations of both ions (Br- and K+) equals the Kps, the solution is saturated. </u>
Given the disociation of the salt in water:
The concentration of both ions are equal (1:1 ratio) and the same as the concentration of KBr added.
The Kps:
[KBr] are <u>moles of the salt per litre of water</u>
Assuming a density of water of 1 g/cm3, 100 g are 0.1 litre
To calculate the mass:
where M is the molecular weight of the salt.
Answer:
(iii) Ionic solids have formula units in the point of the crystal lattice
Explanation:
To further clarify, ionic solids exists as crystal lattice in which each ion is bonded by electrostatic attraction or force to multiple neighboring ions with same or opposite charge thereby balances the force holding them together.
Consider Sodium Chloride (Nacl) as an example, the positive charge of Na+ is bonded by electrostatic attraction to the negative charge of cl-